TA的每日心情 | 开心 2022-1-29 15:04 |
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签到天数: 1 天 [LV.1]初来乍到
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是平面的等角对数螺旋么?cst丛书9里有例子,给你个函数算了,a是螺旋增长率,r是起始半径
( G7 P5 E' M" Y$ b% z! JDim xxx As Double, yyy As Double,ttt As Double,a As Double,r As Double! B8 T1 ?5 l) s# F
a=0.2214 `2 I6 `/ j# d3 e
r=2
- n3 ^9 X% V; [9 M+ v/ y1 }& G+ F6 N$ k9 J& } For ttt = 0 To 4*pi STEP pi/32
3 B' @9 H1 p, h. U xxx=r*exp(a*ttt)*cos(ttt) A/ d; y* D2 L6 y
yyy = r*exp(a*ttt)*sin(ttt)
9 a" q4 r7 D8 r) S9 y8 f* |& { 2 L3 O0 s! J/ c- k4 Z
.LineTo xxx , yyy
7 g( f0 T1 h/ b3 J Next ttt |
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